Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Mar. 30, 2019
Available-for-sale securities
Amortized Cost	$ 2,138,169	$ 3,096,631
Available-for-sale Securities, Gross Unrealized Gains (Instant)	2,699	893
Available-for-sale Securities, Gross Unrealized Losses (Instant)	(1,052)	(17,437)
Estimated Fair Value	2,139,816	3,080,087
Money Market Funds [Member]
Available-for-sale securities
Amortized Cost	656,038	428,150
Available-for-sale Securities, Gross Unrealized Gains (Instant)	0	0
Available-for-sale Securities, Gross Unrealized Losses (Instant)	0	0
Estimated Fair Value	656,038	428,150
Financial institution securities [Member]
Available-for-sale securities
Amortized Cost	325,000	537,795
Available-for-sale Securities, Gross Unrealized Gains (Instant)	0	0
Available-for-sale Securities, Gross Unrealized Losses (Instant)	0	0
Estimated Fair Value	325,000	537,795
Non-financial institution securities [Member]
Available-for-sale securities
Amortized Cost	476,735	702,483
Available-for-sale Securities, Gross Unrealized Gains (Instant)	0	3
Available-for-sale Securities, Gross Unrealized Losses (Instant)	0	(562)
Estimated Fair Value	476,735	701,924
U.S. Government and Agency Securities [Member]
Available-for-sale securities
Amortized Cost	216,178	334,185
Available-for-sale Securities, Gross Unrealized Gains (Instant)	95	39
Available-for-sale Securities, Gross Unrealized Losses (Instant)	0	(139)
Estimated Fair Value	216,273	334,085
Foreign Government and Agency Securities [Member]
Available-for-sale securities
Amortized Cost	254,283	214,455
Available-for-sale Securities, Gross Unrealized Gains (Instant)	7	0
Available-for-sale Securities, Gross Unrealized Losses (Instant)	(17)	0
Estimated Fair Value	254,273	214,455
Mortgage-Backed Securities [Member]
Available-for-sale securities
Amortized Cost	156,836	684,596
Available-for-sale Securities, Gross Unrealized Gains (Instant)	2,445	809
Available-for-sale Securities, Gross Unrealized Losses (Instant)	(477)	(14,635)
Estimated Fair Value	158,804	670,770
Asset-backed Securities [Member]
Available-for-sale securities
Amortized Cost	2,533	76,852
Available-for-sale Securities, Gross Unrealized Gains (Instant)	18	0
Available-for-sale Securities, Gross Unrealized Losses (Instant)	(2)	(483)
Estimated Fair Value	2,549	76,369
Commercial Mortgage Backed Securities [Member]
Available-for-sale securities
Amortized Cost	50,566	118,115
Available-for-sale Securities, Gross Unrealized Gains (Instant)	134	42
Available-for-sale Securities, Gross Unrealized Losses (Instant)	(556)	(1,618)
Estimated Fair Value	$ 50,144	$ 116,539